EP0052180B1 - Circuit de stabilisation de la haute tension de tubes à rayons cathodiques - Google Patents

Circuit de stabilisation de la haute tension de tubes à rayons cathodiques Download PDF

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Publication number
EP0052180B1
EP0052180B1 EP81105811A EP81105811A EP0052180B1 EP 0052180 B1 EP0052180 B1 EP 0052180B1 EP 81105811 A EP81105811 A EP 81105811A EP 81105811 A EP81105811 A EP 81105811A EP 0052180 B1 EP0052180 B1 EP 0052180B1
Authority
EP
European Patent Office
Prior art keywords
voltage
high voltage
circuit arrangement
arrangement according
diode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP81105811A
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German (de)
English (en)
Other versions
EP0052180A1 (fr
Inventor
Helmut Krug
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH
Original Assignee
Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH filed Critical Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH
Priority to AT81105811T priority Critical patent/ATE5624T1/de
Publication of EP0052180A1 publication Critical patent/EP0052180A1/fr
Application granted granted Critical
Publication of EP0052180B1 publication Critical patent/EP0052180B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
    • H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
    • H04N3/18—Generation of supply voltages, in combination with electron beam deflecting
    • H04N3/185—Maintaining dc voltage constant
    • H04N3/1853—Maintaining dc voltage constant using regulation in parallel
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/62—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using bucking or boosting dc sources

Definitions

  • the invention relates to a circuit arrangement for stabilizing the high voltage for cathode ray tubes according to the preamble of claim 1.
  • the deflection sensitivity is known to depend on the level of the anode voltage present.
  • the return pulses of the horizontal deflection are generally transformed to the required size and rectified in order to generate the anode voltage (high voltage). Due to the high transmission ratio of this transformation, the internal resistance of the high-voltage source is inevitably several megohms. If such a high-voltage generator is now loaded with brightly different beam currents due to a change in the image information between light and dark, the sensitivity to deflection changes proportionally with the high voltage. That is, dark images are displayed smaller than light images.
  • FR-A-2016636 a circuit arrangement for stabilizing the high voltage for cathode ray tubes of the type mentioned is known.
  • the essential element for the control is an additional transducer as a variable inductor, with which the total inductance of the horizontal deflection and thus the energy storage and the return pulse are changed.
  • the invention is based on the object of specifying a circuit arrangement for the exact stabilization of the high voltage for cathode ray tubes, which requires only a few additional components and which prevents disturbing changes in the image size which occur when the brightness changes.
  • the circuit arrangement according to the invention enables an improvement in the quality of image display devices, television sets, data display devices and oscilloscopes to be achieved without significant cost increases and great expenditure.
  • the source resistance of the high-voltage generator is made practically ineffective and the disturbances in image size that occur due to the high source resistance of the high-voltage generator in image display devices and oscilloscopes with cathode ray tubes are avoided.
  • the essence of the invention described in more detail below, for example, is to connect the high-voltage generator with a controllable auxiliary voltage, the size of which corresponds to the instantaneous voltage drop across the source resistance of the high-voltage generator, in such a way that the total output voltage always remains constant.
  • the drawing shows an extract of a circuit diagram for a television receiver, only the final stage for the horizontal deflection with the high-voltage generation is shown in its essential elements.
  • a transistor T1 is periodically switched by the pulse generator 1 from the conducting to the blocking phase. As a result, a sawtooth-shaped current is formed in the deflection coils Ly in a known manner.
  • the check pulse 2 rises above the (high-voltage) transformer TR, the peak value of which corresponds to approximately 10 ⁇ U B (operating voltage).
  • This pulse voltage is stepped up on the secondary side in a first secondary winding 5 to the value required for the picture tube anode voltage and rectified with a diode D2.
  • the other end of this secondary winding 5 of the transformer TR is usually at reference potential.
  • a second secondary winding 7 supplies the auxiliary voltages required for various assemblies of the television receiver, as well as the focusing and grid voltages for the picture tube 6.
  • a DC voltage is now derived from these auxiliary voltages, the level of which corresponds to the value of the voltage drop across the resistor R Q (the source resistance) which occurs at maximum beam current, where R Q represents the inevitable copper and stray field losses of the transformer TR.
  • the “cold” end of the high-voltage winding 5 is placed on this PotenUai via a resistor R3.
  • the collector of a direct transistor T2 and a fourth capacitor C4 are also connected.
  • the base of the control transistor T2 becomes a suitable fraction of the high voltage via a zener diode D4 is tapped by a voltage divider (resistors R4 / R5).
  • the maximum high voltage is present at the anode of the picture tube 6.
  • the tap of the voltage divider resistor R5 is set such that the transistor T2 then conducts fully and thus short-circuits the auxiliary voltage obtained via a diode D3 and a capacitor C3 (smoothing element) via the resistor R3 to reference potential.
  • the “cold” end of the high-voltage winding is therefore also at reference potential and the picture tube anode voltage is only determined by the voltage of the winding 5 of the transformer TR.
  • the maximum voltage Uc4 is approximately 1 to 2 kV. With the high-voltage transistors available today, e.g. BUX 87 or BUY 71, this circuit is good and easy to implement.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Details Of Television Scanning (AREA)

Claims (8)

1. Circuit de stabilisation de la haute tension de tubes à rayons cathodiques, comportant un étage de commutation (1, T1) transistorisé, une diode (D1) montée en parallèle avec cet étage et un condensateur (CR) ainsi qu'un transformateur haute tension (TR) dans lequel, dans un enroulement haute tension (5), la tension d'impulsion produite est portée par élévation à la valeur nécessaire au tube à rayons cathodiques (6) et redressée par une diode (D2); ce circuit comportant aussi un diviseur de tension (R4, R5) pour la prise de haute tension, reliée par une diode Zener (D4) à la base d'un transistor de régulation (T2), caractérisé en ce que
- le transistor de régulation (T2) est reliée directement, côté collecteur, par l'intermédiaire d'un point de liaison (P), à la base d'un premeir enroulement secondaire (5), pour produire les impulsions haute tension, et, par l'intermédiaire d'une résistance (R3), à un deuxième enroulement secondaire (7) pour la production de tensions auxiliaires,
- et en ce que le point de liaison (P) ou le collecteur du transistor de régulation (T2) est relié à la masse par l'intermédiaire d'un condensateur de filtrage (C4).
2. Circuit selon la revendication 1, caractérisé en ce qu'une diode (D3) est montée entre le deuxième enroulement secondaire (7) et la résistance (6R3) et qu'un condensateur (C3) est monté en parallèle.
3. Circuit selon la revendication 1 ou 2, caractérisé en ce que la tension de sortie du générateur haute tension est formée par la somme d'au moins deux tensions élémentaires dont l'une au moins peut être régulée.
4. Circuit selon l'une des revendications 1 à 3, caractérisé en ce que la tension élémentaire qui peut être régulée est mise en série avec l'extrémité «froide» de l'enroulement haute tension du transformateur (TR).
5. Circuit selon l'une des revendications 1 à 4, caractérisé en ce que la régulation se fait en fonction de la haute tension.
6. Circuit selon l'une des revendications 1 à 5, caractérisé en ce que la tension élémentaire qui peut être régulée est prélevée sur un diviseur de tension constitué par une résistance ohmique fixe (R4) et une résistance variable (R5).
7. Circuit selon la revendication 6, caractérisé en ce que la résistance variable est un semiconducteur.
8. Circuit selon la revendication 6, caractérisé en ce que la résistance variable est un tube à vide.
EP81105811A 1980-11-14 1981-07-23 Circuit de stabilisation de la haute tension de tubes à rayons cathodiques Expired EP0052180B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81105811T ATE5624T1 (de) 1980-11-14 1981-07-23 Schaltungsanordnung zum stabilisieren der hochspannung fuer kathodenstrahlroehren.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3042982A DE3042982C2 (de) 1980-11-14 1980-11-14 Schaltungsanordnung zum Stabilisieren der Hochspannung für Kathodenstrahlröhren
DE3042982 1980-11-14

Publications (2)

Publication Number Publication Date
EP0052180A1 EP0052180A1 (fr) 1982-05-26
EP0052180B1 true EP0052180B1 (fr) 1983-12-14

Family

ID=6116779

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81105811A Expired EP0052180B1 (fr) 1980-11-14 1981-07-23 Circuit de stabilisation de la haute tension de tubes à rayons cathodiques

Country Status (3)

Country Link
EP (1) EP0052180B1 (fr)
AT (1) ATE5624T1 (fr)
DE (2) DE3042982C2 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4642744A (en) * 1984-11-26 1987-02-10 Tektronix, Inc. Regulated high voltage supply
DE3535121A1 (de) * 1985-10-02 1987-04-09 Thomson Brandt Gmbh Schaltungsanordnung zur erzeugung einer stabilen hohen gleichspannung
DE3871737T2 (de) * 1987-12-04 1993-02-04 Murata Manufacturing Co Hochspannungserzeuger fuer fernsehgeraete.
JP2787052B2 (ja) * 1988-02-12 1998-08-13 日本ヒューレット・パッカード株式会社 高電圧供給装置
US5043598A (en) * 1988-09-20 1991-08-27 Tdk Corporation High voltage supply having a voltage stabilizer
DE4216272B4 (de) * 1992-05-16 2005-07-07 Deutsche Thomson-Brandt Gmbh Schaltung zur Stabilisierung der Hochspannung in einem Fernsehempfänger
DE59307452D1 (de) * 1992-08-05 1997-11-06 Thomson Brandt Gmbh Schaltung zur Stabilisierung der Hochspannung in einem Fernsehempfänger

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1251376B (de) * 1967-10-05 Fernseh GmbH, Darmstadt Schaltung zur Konstanthaltung der Hochspannung in einer Zeilenablenkschaltung
US3040183A (en) * 1959-09-21 1962-06-19 Hughes Aircraft Co Switched power supply
DE1791026A1 (de) * 1968-08-30 1971-10-14 Standard Elek K Lorenz Ag Schaltung zur Konstanthaltung der Hochspannung der Bildroehre transistorisierter Fernsehempfaenger
US3535609A (en) * 1969-04-23 1970-10-20 Us Army High voltage,constant current power supply
JPS501493B1 (fr) * 1969-05-20 1975-01-18
GB1385333A (en) * 1971-02-04 1975-02-26 Matsushita Electric Ind Co Ltd Television receiver
DE2144827C3 (de) * 1971-09-08 1981-06-19 Robert Bosch Gmbh, 7000 Stuttgart Schaltung zum Stabilisieren einer Hochspannung
DE2218058A1 (de) * 1972-04-14 1973-10-31 Licentia Gmbh Schaltung zur stabilisierung der hochspannung fuer das ablenksystem einer kathodenstrahlroehre
US3921059A (en) * 1974-03-22 1975-11-18 Forbro Design Corp Power supply incorporating, in series, a stepped source and a finely regulated source of direct current
US4153871A (en) * 1977-09-02 1979-05-08 International Telephone And Telegraph Corporation Implicit pulse-to-pulse high voltage detection and controller

Also Published As

Publication number Publication date
EP0052180A1 (fr) 1982-05-26
ATE5624T1 (de) 1983-12-15
DE3042982C2 (de) 1982-11-11
DE3161636D1 (en) 1984-01-19
DE3042982A1 (de) 1982-06-03

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